Short Abstract:The Multimedia over IP (MoIP) is related to applications and services based on the transport of various types of media using the IP packets. Typical media examples include voice, video and messaging. The main goals of the course are the description of the design issues to consider during the development of a MoIP system and the problems of Quality of Service and Security of these systems. The course refers the standards that define architectures and protocols used by MoIP systems. In particular, the Session Initiation Protocol (SIP) is considered as a reference concerning both the protocol and the system architecture. The IP Multimedia Subsystem (IMS) is then presented as an example of MoIP service platform based on SIP protocol. In MoIP services, the perceived quality of service (PQoS) is of paramount relevance. On this key aspect, the course presents techniques for the measurement and the monitoring of the PQoS. In particular, the course presents some experimental studies aimed at finding relations between the PQoS and the different problems of the transport service. These studies are focused on the delivery delay, the delay jitter and the packet loss introduced by the IP network. Another key aspect of the MoIP service is the reliability of the system, which depends on the reliability of a large number of devices and their interaction, necessary to provide the different functions related to the offered service. The last part of the course presents some notes on the risks related to the security threats of these systems.